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Added a test that shows using virtual topics in a network of brokers to resolve some of the pain that comes up with durable subscriptions across a network. This test demonstrates the use of Virtual Topics and ConditionalNetworkBridgeFilterFactory with replayWhenNoConsumers=true 

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1445772 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Christian Posta 2013-02-13 17:58:30 +00:00
parent eef380df62
commit aa32dbde83
1 changed files with 176 additions and 0 deletions
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activemq-unit-tests/src/test/java/org/apache/activemq/usecases/VirtualTopicNetworkClusterReactivationTest.java Normal file
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.usecases;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.JmsMultipleBrokersTestSupport;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.region.policy.PolicyEntry;
import org.apache.activemq.broker.region.policy.PolicyMap;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.network.ConditionalNetworkBridgeFilterFactory;
import javax.jms.*;
import java.net.URI;
/**
* @author <a href="http://www.christianposta.com/blog">Christian Posta</a>
*/
public class VirtualTopicNetworkClusterReactivationTest extends JmsMultipleBrokersTestSupport {
private static final String BROKER_A = "brokerA";
private static final String BROKER_B = "brokerB";
private static final String BROKER_A_TRANSPORT_URL = "tcp://localhost:61616";
private static final String BROKER_B_TRANSPORT_URL = "tcp://localhost:61617";
private static final long DEFAULT_SLEEP_MS = 1000;
private ActiveMQTopic topic = new ActiveMQTopic("VirtualTopic.FOO.TEST");
private ActiveMQQueue queue = new ActiveMQQueue("Consumer.FOO.VirtualTopic.FOO.TEST");
/**
* This test shows how to use pub/sub to mimic durable subscribers in a network of brokers.
*
* When using durable subscribers in a broker cluster, you can encounter a situation where a
* subscription gets orphaned on a broker when the client disconnects and reattaches to another
* broker in the cluster. Since the clientID/durableName only need to be unique within a single
* broker, it's possible to have a durable sub on multiple brokers in a cluster.
*
* FOR EXAMPLE:
* Broker A and B are networked together in both directions to form a full mesh. If durable
* subscriber 'foo' subscribes to failover(A,B) and ends up on B, and a producer on A, messages
* will be demand forwarded from A to B. But if the durable sub 'foo' disconnects from B,
* then reconnects to failover(A,B) but this time gets connected to A, the subscription on
* B will still be there are continue to receive messages (and possibly have missed messages
* sent there while gone)
*
* We can avoid all of this mess with virtual topics as seen below:
*
*
* @throws JMSException
*/
public void testDurableSubReconnectFromAtoB() throws JMSException {
// create consumer on broker B
ActiveMQConnectionFactory bConnFactory = new ActiveMQConnectionFactory(BROKER_B_TRANSPORT_URL+ "?jms.prefetchPolicy.queuePrefetch=0");
Connection bConn = bConnFactory.createConnection();
bConn.start();
Session bSession = bConn.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageConsumer bSessionConsumer = bSession.createConsumer(queue);
// create producer on A
ActiveMQConnectionFactory aConnFactory = new ActiveMQConnectionFactory(BROKER_A_TRANSPORT_URL);
Connection aProducerConn = aConnFactory.createConnection();
aProducerConn.start();
Session aProducerSession = aProducerConn.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = aProducerSession.createProducer(topic);
produce(producer, aProducerSession, 5);
// sleep for a sec to let the messages get bridged over to broker B
sleep();
// consumer on B has not consumed any messages, and for some reason goes away:
bSessionConsumer.close();
bSession.close();
bConn.close();
// let the bridge catch up
sleep();
// and now consumer reattaches to A and wants the messages that were sent to B
Connection aConsumerConn = aConnFactory.createConnection();
aConsumerConn.start();
Session aConsumerSession = aConsumerConn.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageConsumer aSessionConsumer = aConsumerSession.createConsumer(queue);
sleep();
// they should all be there
consume(aSessionConsumer, 5);
}
private void consume(MessageConsumer durable, int numMessagesExpected) throws JMSException {
for (int i = 0; i < numMessagesExpected; i++) {
Message message = durable.receive(1000);
assertNotNull(message);
TextMessage textMessage = (TextMessage) message;
System.out.println("received: " + textMessage.getText());
assertEquals("message: " +i, textMessage.getText());
}
}
private void produce(MessageProducer producer, Session sess, int numMessages) throws JMSException {
for (int i = 0; i < numMessages; i++) {
producer.send(sess.createTextMessage("message: " + i));
}
}
@Override
protected void setUp() throws Exception {
maxSetupTime = 1000;
super.setAutoFail(true);
super.setUp();
final String options = "?persistent=true&useJmx=false&deleteAllMessagesOnStartup=true";
BrokerService brokerServiceA = createBroker(new URI(String.format("broker:(%s)/%s%s", BROKER_A_TRANSPORT_URL, BROKER_A, options)));
brokerServiceA.setDestinationPolicy(buildPolicyMap());
brokerServiceA.setDestinations(new ActiveMQDestination[]{queue});
BrokerService brokerServiceB = createBroker(new URI(String.format("broker:(%s)/%s%s", BROKER_B_TRANSPORT_URL, BROKER_B, options)));
brokerServiceB.setDestinationPolicy(buildPolicyMap());
brokerServiceB.setDestinations(new ActiveMQDestination[]{queue});
// bridge brokers to each other statically (static: discovery)
bridgeBrokers(BROKER_A, BROKER_B);
bridgeBrokers(BROKER_B, BROKER_A);
startAllBrokers();
}
private PolicyMap buildPolicyMap() {
PolicyMap policyMap = new PolicyMap();
PolicyEntry policyEntry = new PolicyEntry();
policyEntry.setOptimizedDispatch(true);
ConditionalNetworkBridgeFilterFactory networkBridgeFilterFactory = new ConditionalNetworkBridgeFilterFactory();
networkBridgeFilterFactory.setReplayWhenNoConsumers(true);
policyEntry.setNetworkBridgeFilterFactory(networkBridgeFilterFactory);
policyEntry.setEnableAudit(false);
policyMap.put(new ActiveMQQueue("Consumer.*.VirtualTopic.>"), policyEntry);
return policyMap;
}
private void sleep() {
try {
Thread.sleep(DEFAULT_SLEEP_MS);
} catch (InterruptedException igonred) {
}
}
private void sleep(int milliSecondTime) {
try {
Thread.sleep(milliSecondTime);
} catch (InterruptedException igonred) {
}
}
}